Topics: Radiometric dating age of earth - creation.com
The age of the Earth is approximately 4.54 ± 0.05 billion years (4.54 × 10 9 years ± 1%).     This dating is based on evidence from radiometric age-dating of meteorite  material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.
It is hypothesised that the accretion of Earth began soon after the formation of the calcium-aluminium-rich inclusions and the meteorites. Because the exact amount of time this accretion process took is not yet known, and the predictions from different accretion models range from a few million up to about 100 million years, the exact age of Earth is difficult to determine. It is also difficult to determine the exact age of the oldest rocks on Earth, exposed at the surface, as they are aggregates of minerals of possibly different ages.
Studies of strata , the layering of rocks and earth, gave naturalists an appreciation that Earth may have been through many changes during its existence. These layers often contained fossilized remains of unknown creatures, leading some to interpret a progression of organisms from layer to layer.